The war in Ukraine has put the organisation’s founding principles and its authority on the line. Anne McElvoy asks Linda Thomas-Greenfield, the United States ambassador to the UN, how the Security Council can function in a time of division. Is the sharing of military intelligence by America an act of war? Plus, the ambassador discusses her solutions to the looming food security crisis. Please subscribe to The Economist for full access to print, digital and audio editions:www.economist.com/podcastoffer See acast.com/privacy for privacy and opt-out information.